Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec5a23a6de4297c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-08 23:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a84bf55c49000c07c0a187d74e374e2c SHA-1: 3a4441f23de155e214c0a09ccdc4cc0ca93b5943 SHA-256: 9ec5a23a6de4297c6df1289d761bf9dc29cfff066bd2585723a5b12528daae04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to obscure the true malicious destination. While no scripts were extracted, the presence of numerous external URLs, many hosted on seemingly disposable domains, supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jnejendomsdrift.dk/userfiles/file/54798070851.pdf In PDF document text
    • https://ajambary.com/userfiles/file/88317862307.pdfIn PDF document text
    • https://kaparatt.com/images/File/53295350369.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/wezopinexagepagoziba.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/nosazuxoniv.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/boleri.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/rulekaripezokikixajir.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377bd20ab1b---gejewunavunexi.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/neserugesa.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/tizopasanuvudeguvepopuk.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/17568592948.pdfIn PDF document text
    • http://consade.com/userfiles/file/jilelinemizidodazurega.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/77504800560.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/giges.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40433668600.pdfIn PDF document text
    • https://estoniapools.com/contents/files/xudumovufedapoze.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6675ef736e77b35d74102ac492a3526c/73728948283.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135eef922f39---21532655215.pdfIn PDF document text
    • http://dalaichau.com/files/60092257957.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/67788778134.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/65977822428.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109031603569196.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/92573602212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hd+live+wallpapers+for+android+mobile+full+screenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24A 14920 bytes
SHA-256: 34520e12e8b6e2e6d1d603ed95e173a5e2f39ffdfe481ba1c8459d69067bda4d
font_01_sfnt_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 11068 bytes
SHA-256: 6d895e719e93c94f2991f52e86959802bc382309d7e33ad012ac3149babcba6e
font_02_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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